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Cost-Justifying Usability, 2nd Edition
book

Cost-Justifying Usability, 2nd Edition

by Randolph G. Bias, Deborah J. Mayhew
May 2005
Beginner to intermediate
640 pages
23h 47m
English
Morgan Kaufmann
Content preview from Cost-Justifying Usability, 2nd Edition
For instance, suppose we have obtained measurements from 10 users apiece
on site X and site Y, and the obtained value of the Student’s t statistic is 1.70.
The bigger this statistic is, the greater the difference between site X and site Y.
The table of values of t (with df = 18, p £ 0.05) tells us that the value of R ranges
from 1.734 to infinity, so we cannot reject H(0). Now, we obtain more observa-
tions, until we have 50 observations at each site. Let’s assume that the obtained
value of the statistic stays about the same (i.e., the size of the difference effect
does not change, although we have tested many more users) and now we see in
the table ...
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Publisher Resources

ISBN: 9780120958115